PDF PCA8576D Data sheet ( Hoja de datos )

Número de pieza	PCA8576D
Descripción	Automotive 40 x 4 LCD segment driver
Fabricantes	NXP Semiconductors
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No Preview Available ! PCA8576D Automotive 40 x 4 LCD segment driver for low multiplex rates up to 1:4 Rev. 1 — 4 April 2011 Product data sheet 1. General description The PCA8576D is a peripheral device which interfaces to almost any Liquid Crystal Display (LCD) with low multiplex rates. It generates the drive signals for any static or multiplexed LCD containing up to four backplanes and up to 40 segments. It can be easily cascaded for larger LCD applications. The PCA8576D is compatible with most microcontrollers and communicates via the two-line bidirectional I2C-bus. Communication overheads are minimized by a display RAM with auto-incremented addressing, by hardware subaddressing and by display memory switching (static and duplex drive modes). 2. Features and benefits  AEC-Q100 compliant for automotive applications  Single chip LCD controller and driver  Selectable backplane drive configuration: static or 2, 3, 4 backplane multiplexing  Selectable display bias configuration: static, 12 or 13  Internal LCD bias generation with voltage-follower buffers  40 segment drives:  Up to 20 7-segment numeric characters  Up to 10 14-segment alphanumeric characters  Any graphics of up to 160 elements  40  4-bit RAM for display data storage  Auto-incremented display data loading across device subaddress boundaries  Display memory bank switching in static and duplex drive modes  Versatile blinking modes  Independent supplies possible for LCD and logic voltages  Wide power supply range: from 1.8 V to 5.5 V  Wide logic LCD supply range:  From 2.5 V for low-threshold LCDs  Up to 6.5 V for high-threshold twisted nematic LCDs  Low power consumption  400 kHz I2C-bus interface  May be cascaded for large LCD applications (up to 2560 elements possible)  No external components required  Compatible with chip-on-glass and chip-on-board technology  Manufactured in silicon gate CMOS process 1 page NXP Semiconductors PCA8576D Automotive 40 x 4 LCD segment driver for low multiplex rates 7. Functional description The PCA8576D is a versatile peripheral device designed to interface any microcontroller with a wide variety of LCDs. It can directly drive any static or multiplexed LCD containing up to four backplanes and up to 40 segments. The possible display configurations of the PCA8576D depend on the number of active backplane outputs required. A selection of display configurations is shown in Table 4. All of these configurations can be implemented in the typical system shown in Figure 3. Table 4. Selection of possible display configurations Number of Backplanes Icons Digits/Characters 7-segment 14-segment 4 160 20 10 3 120 15 7 2 80 10 5 1 40 5 2 Dot matrix/ Elements 160 (4  40) 120 (3  40) 80 (2  40) 40 (1  40) VDD tr R ≤ 2CB HOST MICRO- PROCESSOR/ MICRO- CONTROLLER SDA SCL OSC VDD VLCD PCA8576D 40 segment drives 4 backplanes LCD PANEL (up to 160 elements) A0 A1 A2 SA0 VSS VSS 013aaa469 Fig 3. The resistance of the power lines must be kept to a minimum. For chip-on-glass applications, due to the Indium Tin Oxide (ITO) track resistance, each supply line must be routed separately between the chip and the connector. Typical system configuration The host microprocessor or microcontroller maintains the 2-line I2C-bus communication channel with the PCA8576D. The internal oscillator is enabled by connecting pin OSC to pin VSS. The appropriate biasing voltages for the multiplexed LCD waveforms are generated internally. The only other connections required to complete the system are to the power supplies (VDD, VSS and VLCD) and the LCD panel chosen for the application. 7.1 Power-on reset At power-on the PCA8576D resets to the following starting conditions: • All backplane outputs are set to VLCD • All segment outputs are set to VLCD • The selected drive mode is: 1:4 multiplex with 13 bias • Blinking is switched off PCA8576D Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 1 — 4 April 2011 © NXP B.V. 2011. All rights reserved. 5 of 42 5 Page NXP Semiconductors PCA8576D Automotive 40 x 4 LCD segment driver for low multiplex rates BP0 BP1 Sn Sn+1 state 1 state 2 VLCD 2VLCD / 3 VLCD / 3 VSS VLCD 2VLCD / 3 VLCD / 3 VSS VLCD 2VLCD / 3 VLCD / 3 VSS VLCD 2VLCD / 3 VLCD / 3 VSS VLCD 2VLCD / 3 VLCD / 3 0V −VLCD / 3 −2VLCD / 3 −VLCD VLCD 2VLCD / 3 VLCD / 3 0V −VLCD / 3 −2VLCD / 3 −VLCD Tfr LCD segments state 1 state 2 (a) Waveforms at driver. (b) Resultant waveforms at LCD segment. mgl747 (1) Vstate1(t) = VSn(t)  VBP0(t). (2) Von(RMS) = 0.745VLCD. (3) Vstate2(t) = VSn+1(t)  VBP1(t). (4) Voff(RMS) = 0.333VLCD. Fig 7. Waveforms for the 1:2 multiplex drive mode with 13 bias PCA8576D Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 1 — 4 April 2011 © NXP B.V. 2011. All rights reserved. 11 of 42 11 Page

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